Running the karma tests of the pull request plugin sometimes fail.
Running "karmaconfig:unit" (karmaconfig) task
Running "karma:continuous" (karma) task
15 01 2018 15:07:22.497:INFO [karma]: Karma v0.13.22 server started at
http://localhost:9018/
15 01 2018 15:07:22.651:INFO [launcher]: Starting browser ChromiumHeadless
15 01 2018 15:07:28.701:INFO [HeadlessChrome 0.0.0 (Ubuntu 0.0.0)]: Connected on socket AGe8dSkRY8VROJnLAAAA with id 46543975
15 01 2018 15:07:38.893:WARN [HeadlessChrome 0.0.0 (Ubuntu 0.0.0)]: Disconnected (1 times), because no message in 10000 ms.
HeadlessChrome 0.0.0 (Ubuntu 0.0.0): Executed 0 of 0 DISCONNECTED (10.231 secs / 0 secs)
Warning: Task "karma:continuous" failed. Use --force to continue.
Aborted due to warnings.